[idea] refactoring: extract and reuse common implementation of ExternalProductResourceUrls (IJPL-204)

It appears that IDEA Community and Ultimate use the same external URLs, so it doesn't make to have two different implementations of ExternalProductResourceUrls for them. So intellij.idea.customization.base module is introduced to define the common IntelliJIdeaExternalResourceUrls implementation.

GitOrigin-RevId: 997596458fb391b7033e11a9c15851e72cfeaef1

idea/customization/base/intellij.idea.customization.base.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" packagePrefix="com.intellij.idea.customization.base" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module" module-name="intellij.platform.ide.impl" />
+  </component>
+</module>

idea/customization/base/src/IntelliJIdeaExternalResourceUrls.kt

@@ -0,0 +1,15 @@
+// Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package com.intellij.idea.customization.base
+
+import com.intellij.platform.ide.impl.customization.BaseJetBrainsExternalProductResourceUrls
+
+class IntelliJIdeaExternalResourceUrls : BaseJetBrainsExternalProductResourceUrls() {
+  override val basePatchDownloadUrl: String
+    get() = "https://download.jetbrains.com/idea/"
+
+  override val youtrackProjectId: String
+    get() = "IDEA"
+
+  override val shortProductNameUsedInForms: String
+    get() = "IDEA"
+}